Compatibility agent for aqueous polypigmentary suspensions containing hydrated calcium sulfate

Claim 1

A copolymer having the formula (I): ##STR104## wherein (B) is an ethylene unit having a phosphate or phosphonate group, (A) is an ethylene unit having a carboxylic acid group, and (C) is an ethylene unit which may have an ester group, and wherein L is a value such that the amount of (B) is between 5 and 95 parts by weight, based on the total amount of (A), (B), and (C), one of K and M may be 0 and the sum of K, L, and M equals 100 parts by weight; wherein R 1 is one member selected from the group consisting of hydrogen and a carboxylic acid group which may be esterified with a C 1 to C 12 alkyl group; R 2 is one member selected from the group consisting of hydrogen and C 1 -C 12 alkyl; R 3 and R' 3 are each, independently, one member selected from the group consisting of hydrogen, a carboxylic acid group, halogen, C 1 -C 12 alkyl, and substituted or unsubstituted aryl; R 4 is one member selected from the group consisting of hydrogen, C 1 -C 12 alkyl, substituted or unsubstituted aryl, and a carboxylic acid group which may be esterified with a C 1 -C 12 alkyl group; R 5 is one member selected from the group consisting of an ester group, a substituted amide, oxygen, C 1 -C 12 alkylene, substituted or unsubstituted arylene, substituted or unsubstituted cycloalkylene, substituted or unsubstituted cycloalkenylene and substituted or unsubstituted aralkylene, an ethylene or propylene oxide carboxylic ester of the formula: ##STR105## in which R 10 is hydrogen or methyl and n has a value of between 1 and 50, an alkyl, aryl, or aralkyl carboxylic ester of the formula: ##STR106## wherein R 11 contains 1 to 12 carbon atoms, and a substituted amide of the formula: ##STR107## wherein R 12 is hydrogen, C 1 -C 12 alkyl, substituted or unsubstituted aryl, or aralkyl, and R 13 is C 1 -C 12 alkylene, substituted or unsubstituted arylene, substituted or unsubstituted cycloalkylene, substituted or unsubstituted cycloalkenylene, or substituted or unsubstituted aralkylene; R 6 is one member selected from the group consisting of hydrogen, a cation, an amine, C 1 -C 3 alkyl, substituted or unsubstituted aryl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted aralkyl, a C 1 -C 12 ester, and a substituted amide; R 7 is one member selected from the group consisting of hydrogen, a carboxylic acid group, a C 1 -C 12 ester, C 1 -C 12 alkyl, aryl, cycloalkyl, cycloalkenyl, and aralkyl; R 8 is one member selected from the group consisting of hydrogen, a carboxylic acid group, C 1 -C 3 alkyl, and halogen; and R 9 is one member selected from the group consisting of a C 1 -C 12 ester, substituted or unsubstituted amide, C 1 -C 12 alkyl, cycloalkyl, cycloalkenyl, aryl, aralkyl, halogen, --CO 2 H, and a sulfonated or sulfated alkyl or aryl group.